PC87373 datasheet(89/174 Pages) NSC

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6.0 System Wake-Up Control (SWC) (Continued)

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Revision 1.1

6.3.2

Standard LED Control Register (SLEDCTL)

This register configures the standard LED control of the two LEDs connected to pins GRN_LED and YLW_LED of the

PC87373 device. It is reset to 03h.

Power Well: VSB3

Location:

Offset 00h, when LED_OPT = 01 in the SWC_CTL register

Type:

R/W or RO

Bit

43210

Name

Reserved

BLINK

GRN_YLW

Reset

00011

Bit

Description

7-2

Reserved.

BLINK (LEDs Blink Control). This bit controls the operation mode (either blinking or constantly on) of the LED

selected by GRN_YLW bit. Blinking rate is 0.667 Hz with a duty cycle of 41.7%. When the system is in sleep state

S5, both LEDs are forced off regardless of BLINK and GRN_YLW bit values; see Table 34.

0: Selected LED blinking

1: Selected LED constantly on (default)

GRN_YLW (Green-Yellow LED Select). This bit selects which of the two LEDs (GRN_LED or YLW_LED) is

active. The LED which is not active is off; see Table 34.

0: Yellow LED (connected to YLW_LED pin) selected

1: Green LED (connected to GRN_LED pin) selected (default)

Table 34. GRN_LED and YLW_LED States

SLP_S5 pin

GRN_YLW bit

BLINK bit

GRN_LED pin

YLW_LED pin

1. SLP_S5 = 0: System is in sleep state S5.

2. X is either logic “0” or logic “1”.

1000

Blink

1010

TRI-STATE

Blink

TRI-STATE

PC87373 数据表(PDF) 89 Page - National Semiconductor (TI)

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